Three rare ammonite fossils discovered in spoil heaps at Grange Top Quarry at Heidelberg Materials Cement in Ketton are now within the collections of Rutland County Museum and have given researchers new evidence about the county's Jurassic past.
A fourth fossil collected from Park Lodge Quarry near Gretton is the first ammonite to be unequivocally recorded from the Collie Weston beds, the lower most part of the Lincolnshire limestone formation in this area.
It indicates a middle Jurassic age around 170 million years ago for the beds located at the quarry and this matches with the Ketton specimens and earlier discoveries in Lincoln and Northamptonshire.
They collectively confirm an origin for the lower Lincolnshire limestone across the three counties, which was at the time covered by a warm sea bathed in a subtropical climate.
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